diff --git a/src/main/java/com/xujie/sys/modules/project/entity/ProjectPart.java b/src/main/java/com/xujie/sys/modules/project/entity/ProjectPart.java
index 48fe0c19..ea0fbf5d 100644
--- a/src/main/java/com/xujie/sys/modules/project/entity/ProjectPart.java
+++ b/src/main/java/com/xujie/sys/modules/project/entity/ProjectPart.java
@@ -100,6 +100,11 @@ public class ProjectPart {
 
     private String testPartNo;
 
+    /**
+     * 客户编码。首次同步走本实体的 insert，缺少该字段时不会写入 customer_no。
+     */
+    private String customerNo;
+
 
     /**
      *
diff --git a/src/main/java/com/xujie/sys/modules/sampletracking/service/impl/SampleTrackingServiceImpl.java b/src/main/java/com/xujie/sys/modules/sampletracking/service/impl/SampleTrackingServiceImpl.java
index 929fd708..c29bab53 100644
--- a/src/main/java/com/xujie/sys/modules/sampletracking/service/impl/SampleTrackingServiceImpl.java
+++ b/src/main/java/com/xujie/sys/modules/sampletracking/service/impl/SampleTrackingServiceImpl.java
@@ -910,6 +910,8 @@ public class SampleTrackingServiceImpl implements SampleTrackingService {
     private ProjectPart buildProjectPartForInsert(ProjectPartTrackingData trackingPart, String operator) {
         ProjectPart projectPart = new ProjectPart();
         BeanUtils.copyProperties(trackingPart, projectPart);
+        // 客户编码必须显式落到插入实体。否则首次 MyBatis-Plus insert 不写 customer_no，只有再次同步的 update 才会补上。
+        projectPart.setCustomerNo(trackingPart.getCustomerNo());
         projectPart.setId(null);
         projectPart.setCreateBy(resolveOperator(trackingPart.getCreateBy(), operator));
         projectPart.setUpdateBy(operator);